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A warning sign to stay on the trail to the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

Steps along the Giant Logs Trail leading to a scenic overlook in Petrified Forest National Park, Arizona, United States of America, North America

Hills of purple and gray bentonite near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Purple badlands of bentonite near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Rock islands above the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A solitary rock hoodoo in the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A solitary rock hoodoo in the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A circular walkway for the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

Trial bike rider kicking up sand at the sand dunes of Lancelin, Western Australia, Australia, Pacific

Mudbrick buildings of an ancient village with red canyons in backgrounds, Ziz Valley, Atlas mountains, Morocco, North Africa, Africa

Family with one child enjoying a camel ride in the desert, Erg Chebbi, Merzouga, Sahara Desert, Morocco, North Africa, Africa

View of the fortified old village and surrounding mountains, Telouet Kasbah High Atlas, Morocco, North Africa, Africa

Historic village in a desert oasis framed by majestic gorges, Ziz Valley, Atlas mountains, Morocco, North Africa, Africa

The Great Sphinx of Giza, Khafre Pyramid in the background, Great Pyramids of Giza, UNESCO World Heritage Site, Giza, Egypt, North Africa, Africa

The columns of a ruined structure at the Pre-Aksumite settlement of Qohaito (Koloe), Eritrea, Africa

Panorama of Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

A section of Petrified Forest National Park called Angel Garden, northwest of the Onyx Bridge, Arizona, United States of America, North America

Bryce Canyon at dawn, from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

A female greater kudu (Tragelaphus strepsiceros) and springbok (Antidorcas marsupialis) drinking at a waterhole, Nxai Pan National Park, Botswana, Africa

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon is a clay-sand structures formed on the slopes of arid mountains cut by water streams.

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Monument, Chinchorro Mummies, UNESCO World Heritage Site, Camarones Valley, northern Atacama desert, Chile, South America

A hoodoo spire shaped like a Horse Head, in the valley below Blue Mesa of Petrified Forest National Park, Arizona, United States of America, North America

Warm light of the sunrise envelop the sand dunes at Mesquite Flat, Death Valley, California, United States of America, North America

Details of the sand dunes at Mesquite Flat, Death Valley, California, United States of America, North America

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Gray clay flats below Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Highway US89A looking east to Vermilion Cliffs National Monument with Kaibab National Forest boundary sign, Arizona, United States of America

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

Monastery of Saint Ananias known as Deyrulzafaran or Saffron Monastery, Stairs, Mardin, Turkey, Asia Minor, Asia

An unnamed canyon that leads into Dead Wash at Petrified Forest National Park, Arizona, United States of America

Woman on trampoline, Now You See Me, Now You Don't, artist Manal Aldowayan, AlUla exhibition, Ashar Valley, Medina Province, Saudi Arabia

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

The Thirteen Mile Cattle Tank off of Corva Road in the Kaibab National Forest near Ash Fork Arizona, USA

Shepherd with a flock of sheep and Pashmina goats on the path to Stokla pass (4900) from Rumbak, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Aerial view from helicopter, of a farm in an ancient oasis in the desert with canyons of the Ashar Valley,AlUla, Medina Province, Saudi Arabia

Aerial view of Qasr al-Farid, the largest tomb within Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

North Window, Elephant Butte on left, Cly Butte on right, Monument Valley Navajo Tribal Park, Utah, United States of America

The Omani flag at half mast to signify the death of Sultan Qaboos at Ras Al Had Castle, Sultanate of Oman, Middle East

Panoramic view by drone of straight empty road through Danakil desert, Afar Region, Ethiopia, Africa

Sunset in the giant sand dunes of the Sahara Desert, Timimoun, western Algeria, North Africa, Africa

Mounds and cliffs of expansive clay called Bentonite in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

Panorama view of the Painted Desert from Tawa Point in Petrified Forest National Park, Arizona, United States of America, North America